My advice to you would be to calm it down a little bit. I'd reconsider the time frame that you are looking at in terms of giving it up if it doesn't work in 3 months. Penis Enlargement works, trust me. Or look at my pictures.
Take your time, build up the intensity slowly and you will gain. What DLD points out time after time is that atitude is an extremely important thing. This is overlooked all the time. You should make it a part of your routine to think positively about not only your penis but your entire body also. Take control of your mind and think positively at all times about your routine and it will have dramatic effects. It seems as if you are setting yourself up for failure by saying 'I'll give it 3 months and then stop'. What you should be saying to yourself, almost to the point of it becoming a mantra is 'My penis is getting bigger', etc. This is a very big deal and is probably at least 50% of the entire Penis Enlargement game and yet no one ever really addresses it. You can literally program your mind into making gains. I personally include it as part of my daily routine and it has changed my results and results 100%. Visualisation is an extremely powerful tool and by associating your mind with the place that you want to end up you will be directly effecting the results of your Penis Enlargement practice. Visualise your penis exactly how you want it to be as clearly as you can whilst you do your Penis Enlargement or seperately for 10 minutes per day and then your attitude will go through a massive shift. The place that you inhabbit internally in any aspect of life will manifest physically and due to this you must change the way that you are thinking about your routine. Picture where you want to end up enough and sure enough that is where you will eventually find yourself. In turn, say to yourself 'I will quit aftre 3 months if nothing happens' and guess what will happen. Say to yourself 'I will have an 8" penis no matter what' and guess what will happen.